Are tonics single use?
All one time use unless it is an Endless or Infinite.
There are two types of tonics. Single use and endless/infinite (two names for the same thing). The single use disappear from your inventory when you use them. If it doesn’t say endless or infinite then it’s single use.
To see which is which and where to get them, read this
https://wiki.guildwars2.com/wiki/Tonic
Be careful what you ask for
ANet may give it to you.
ANet may give it to you.
(edited by Just a flesh wound.3589)